<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>package org.slf4j.impl;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.lang.reflect.Method;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>import org.slf4j.helpers.Util;<a name="line.5"></a>
<span class="sourceLineNo">006</span><a name="line.6"></a>
<span class="sourceLineNo">007</span>public class VersionUtil {<a name="line.7"></a>
<span class="sourceLineNo">008</span>        static final int MINIMAL_VERSION = 5;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>        static public int getJavaMajorVersion() {<a name="line.10"></a>
<span class="sourceLineNo">011</span>                String javaVersionString = Util.safeGetSystemProperty("java.version");<a name="line.11"></a>
<span class="sourceLineNo">012</span>                return getJavaMajorVersion(javaVersionString);<a name="line.12"></a>
<span class="sourceLineNo">013</span>        }<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>        static int getJavaMajorVersion(String versionString) {<a name="line.15"></a>
<span class="sourceLineNo">016</span>                if (versionString == null)<a name="line.16"></a>
<span class="sourceLineNo">017</span>                        return MINIMAL_VERSION;<a name="line.17"></a>
<span class="sourceLineNo">018</span>                if (versionString.startsWith("1.")) {<a name="line.18"></a>
<span class="sourceLineNo">019</span>                        return versionString.charAt(2) - '0';<a name="line.19"></a>
<span class="sourceLineNo">020</span>                } else {<a name="line.20"></a>
<span class="sourceLineNo">021</span>                        // we running under Java 9 or later<a name="line.21"></a>
<span class="sourceLineNo">022</span>                        try {<a name="line.22"></a>
<span class="sourceLineNo">023</span>                                Method versionMethod = Runtime.class.getMethod("version");<a name="line.23"></a>
<span class="sourceLineNo">024</span>                                Object versionObj = versionMethod.invoke(null);<a name="line.24"></a>
<span class="sourceLineNo">025</span>                                Method majorMethod = versionObj.getClass().getMethod("major");<a name="line.25"></a>
<span class="sourceLineNo">026</span>                                Integer resultInteger = (Integer) majorMethod.invoke(versionObj);<a name="line.26"></a>
<span class="sourceLineNo">027</span>                                return resultInteger.intValue();<a name="line.27"></a>
<span class="sourceLineNo">028</span>                        } catch (Exception e) {<a name="line.28"></a>
<span class="sourceLineNo">029</span>                                return MINIMAL_VERSION;<a name="line.29"></a>
<span class="sourceLineNo">030</span>                        }<a name="line.30"></a>
<span class="sourceLineNo">031</span>                }<a name="line.31"></a>
<span class="sourceLineNo">032</span>        }<a name="line.32"></a>
<span class="sourceLineNo">033</span>}<a name="line.33"></a>




























































</pre>
</div>
</body>
</html>
